<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <title>Airline - ECHARTS-GL</title>
        <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
        <meta name="apple-mobile-web-app-capable" content="yes"> <!-- Fullscreen Landscape on iOS -->
        <link rel="stylesheet" href="./common.css">
    </head>
    <body>
        <div id="main"></div>
        <script src="../node_modules/echarts/dist/echarts.js"></script>
        <script src="../node_modules/echarts/theme/dark.js"></script>
        <script src="../dist/echarts-gl.js"></script>
        <script src="lib/jquery.min.js"></script>
        <script src="js/commonUI.js"></script>
        <script>
            var chart = echarts.init(document.getElementById('main'), 'dark');

            $.getJSON('data/flights.json', function (data) {
                // Airport: [name, city, country, longitude, latitude]
                var airports = data.airports.map(function (item) {
                    return {
                        coord: [item[3], item[4]]
                    }
                });

                // Route: [airlineIndex, sourceAirportIndex, destinationAirportIndex]
                var routesGroupByAirline = {};
                data.routes.forEach(function (route) {
                    var airline = data.airlines[route[0]];
                    var airlineName = airline[0];
                    if (!routesGroupByAirline[airlineName]) {
                        routesGroupByAirline[airlineName] = [];
                    }
                    routesGroupByAirline[airlineName].push(route);
                });

                var series = data.airlines.map(function (airline) {
                    var airlineName = airline[0];
                    var routes = routesGroupByAirline[airlineName];

                    if (!routes) {
                        return null;
                    }
                    return {
                        type: 'lines3D',
                        name: airlineName,


                        effect: {
                            show: false,
                            trailWidth: 4
                        },

                        lineStyle: {
                            width: 2,
                            color: 'rgb(50, 50, 150)',
                            opacity: 0.1
                        },
                        blendMode: 'lighter',

                        data: routes.map(function (item) {
                            return [airports[item[1]].coord, airports[item[2]].coord];
                        })
                    };
                }).filter(function (series) {
                    return !!series;
                });

                chart.setOption({
                    backgroundColor: '',
                    legend: {
                        show: false,
                        left: 'left',
                        data: Object.keys(routesGroupByAirline),
                        orient: 'vertical'
                    },
                    globe: {
                        baseTexture: 'asset/world.topo.bathy.200401.jpg',
                        heightTexture: 'asset/elev_bump_4k.jpg',

                        shading: 'lambert',

                        light: {
                            ambient: {
                                intensity: 0.4
                            },
                            main: {
                                intensity: 0.4
                            }
                        },

                        viewControl: {
                            autoRotate: false
                        }
                    },
                    series: series
                });

                window.onresize = chart.resize;

            });
        </script>
    </body>
</html>